Noticing rings, glare, or glowing circles around lights, especially during night time can be bothersome. These visual disturbances, commonly known as halos around lights, often interfere when you’re driving in the dark, looking at bright screens or streetlights.
Though seeing halos occasionally can be harmless, persistent eye halos can be indicative of underlying eye problems that require immediate attention. Being aware of halos, their cause and when to get medical attention is crucial to protect your vision.
What Are Halos Around Lights?
Halos around lights look like bright circles or glowing rings that surround the light sources. These rings appear misty, white, or even rainbow-colored and often vary in intensity. They are often described as starbursts, glare, or even foggy circles around headlights or bulbs.
Generally, eye halos occur when the light that enters the eyes scatters rather than focusing perfectly on the retina. This phenomenon takes place because of changes in the cornea, tear film, lens, or even eye pressure.
This scattering can happen due to changes in the cornea, lens, tear film, or eye pressure. Occasional halos can be a result of dryness or eye fatigue. However, you should not ignore it when it worsens.
Types of Eye Halos
Majorly, there are two types of eye halos:
- White or Clear Halos
Clear or white halos appear soft, shiny, or glowing rings around the lights. Usually, they are associated with superficial or refractive issues in the eye. Common causes of these clear halos are:
- Dry eyes that irritate the tear film
- Refractive errors like nearsightedness (myopia), astigmatism, etc
When your eyes are not lubricated enough or vision correction is improper, light scatters around, creating glare, halos, and affecting clarity at night.
- Coloured Halos
Coloured halos in eye look like rainbow rings around lights. This halo around eyeball is more concerning and can arise due to internal eye conditions. Rainbow halos are often indicative of:
- Corneal edema, i.e. build up of excess fluid in the cornea
- Increased eye pressure, usually seen in glaucoma patients
If you notice colored halo around eyeball suddenly, accompanied by eye pain, redness, nausea, or headache, it can be a sign of acute angle-closure glaucoma, which is an emergency condition.
Common Causes of Halos in Vision
Refractive Errors
Poorly corrected or uncorrected refractive errors are two most common causes of halos in vision, particularly in night or in dim lighting. Refractive errors include:
- Myopia (near-sightedness)- Distant objects appear blurred
- Hyperopia (far-sightedness), which strains the eyes and affects focus
- Astigmatism, where an irregularly shaped cornea bends light unevenly
When light doesn’t focus sharply on the retina, it spreads and creates glare or halos around light sources. Ill-fitting glasses or contact lenses can further exaggerate this distortion, particularly while driving at night or looking at LED and oncoming headlights.
Cataracts
Cataracts is a common eye condition marked by clouding of the eye lens, preventing light from passing through clearly. This clouding of lens causes:
- Glare and halos around lights
- Having problem with late night drives and reading road signs
- Lesser contrast sensitivity and faded vision
Halos, because of the cataracts, get worse with time. They are often more noticeable when sunlight is bright or in dim environments with artificial lighting dominating.
Dry Eye Syndrome
Dry eye disorders affect the layers of the tear film. When your tears evaporate very quickly or are of poor quality, it causes:
- Blurred vision
- Sensitivity to bright light
- Glare and halos
Dry eye-related halos often vary in intensity throughout the day and temporarily get better with blinking or lubricating eye drops.
Glaucoma
Halos can be an alarming sign of acute angle-closure glaucoma, a serious eye problem caused due to a sudden increase in eye pressure. Warning symptoms include:
- Coloured halos in vision
- Reddened or paining eye
- Headache, nausea or vomiting
- Headache, nausea, or vomiting
Glaucoma needs immediate medical intervention to save your vision from permanent loss.
Corneal Conditions
The cornea is a crucial factor in focusing light. Corneal aberrations or abrasions can lead to halos. Common causes of corneal irregularities are:
- Corneal edema, where swelling significantly affects vision clarity.
- Keratoconus, an eye condition marked by thin cone-shaped cornea
These conditions affect how light enters your eye, causing glare and halos.
Post-Surgical Causes
Seeing halos is common after getting a surgical procedure like LASIK or cataract surgery. Mostly, halos are short-term and diminish as the eye heals. However, stubborn halos may occur due to dry eye, residual refractive errors, or lens-related issues and need further check-ups or corrective treatment.
Halos Around Lights and Glaucoma
Noticing halos around lights is often associated with glaucoma, especially acute angle-closure glaucoma, which is a medical emergency. In this eye condition, there is a sudden spike in eye pressure, which affects how light passes through the cornea and results in coloured or rainbow halos.
Halos linked with glaucoma are usually not subtle. They usually appear suddenly along with other symptoms such as red or painful eyes, headache, nausea, or vomiting. Unlike dry eye or refractive issues, these halos do not improve with blinking or rest. It’s crucial to note that you may not notice halos in the early stages of chronic glaucoma.
This necessitates regular eye checkups, especially for people who have high-risk factors like very high eye pressure, family history or advancing age. If the occurrence of halos is sudden and feels painful or intense, you should immediately go for an evaluation of retina or glaucoma to prevent permanent vision
Signs and Symptoms Associated with Eye Halos
You may see halos around lights rarely. They are usually accompanied by other eye-related symptoms which help in identifying the underlying reason.
Common symptoms associated with eye halos include:
- Hazy or blurred vision
- Being hyper sensitivity to light
- Difficulty with dim light vision
- Eye discomfort, dryness, or irritation
- Eye strain or headache
In serious cases, especially when accompanied by corneal swelling or glaucoma, symptoms include red and painful eyes, nausea, etc.
Risk Factors for Seeing Halos Around Lights
Certain risk factors increase the chances of noticing halos in vision. These include both lifestyle-related and medical risk factors.
- Poorly corrected or uncorrected refractive errors
- Cataracts or other age-related changes in the lens
- Persistent dry eyes
- Glaucoma or high eye pressure
- Previous eye procedures like LASIK etc.
- Excessive screen time causes eye fatigue
How Are Halos Around Lights Diagnosed?
To diagnose halos around lights, eye doctors also try to go beyond the symptoms to identify the root cause. Doctors start the test with a detailed discussion of the symptoms, when did you start seeing halos, their colour, and whether they get worse at night or not.
Diagnostic tests include these:
- Visual acuity and refraction tests
- Slit-lamp test to check the cornea and the eye lens
- Checking the tear film for dry eye
- Measuring eye pressure to rule out glaucoma
- Dilated retinal exam when required
On the basis of the results, the doctor examines whether the halos are because of minor issues like dryness or a more serious eye condition that requires proper eye treatment. Timely diagnosis is the only safe way to prevent long-term vision complications.
Treatment Options for Halos Around Lights
The right treatment option for halos around lights depends on its underlying cause, not only symptomatic relief. Once the doctors identify the reason behind the scattering of light, customized treatment improves visual clarity and comfort.
Corrective Measures
In several cases, getting rid of halos requires vision.
- Updated eyeglasses or contact lenses
Precise refraction and properly fitted lenses help in focusing light properly on the retina, diminishing halos and glare, especially in dim light conditions.
Medical Treatment
When the underlying reason for halos is an eye condition, medical management is essential.
- Managing dry eyes
Doctors prescribed lubricating eye drops, healthier lifestyle changes, and treatment to stabilize the tear film, control light scattering, thereby enhancing the vision quality.
- Glaucoma medications
If increased eye pressure is the real culprit behind your halos in vision, it’s crucial to protect your optic nerve and alleviate symptoms. Sudden appearance of halos (especially colored halos) requires urgent treatment.
Surgical Treatment
Surgical treatment is necessary when there are structural eye changes causing the halos.
- Cataract surgery: In this procedure, the doctor replaces the cloudy lens with a new artificial, clear intraocular lens. This gives great relief from halos and glare.
- Laser procedures (if indicated): Eye doctors advise laser procedures in specific cases like correcting residual refractive errors after surgery, glaucoma management, etc.
Post-Surgical Halo Management
Some patients may experience short-term halos after undergoing eye surgery.
- Neural adaptation: The brain slowly adapts to new visual inputs, resulting in affected awareness of halos.
- Medications and time-based recovery: Managing dry eyes, inflammation and letting a proper healing period generally gives gradual improvement.
Can Halos Around Lights Be Prevented?
While not all causes of halos are preventable, certain steps can significantly reduce the risk.
Preventive measures include:
- Regular eye checkups to detect early changes
- Using updated vision correction
- Managing dry eyes proactively
- Protecting eyes from excessive screen strain
- Following post-surgery care instructions carefully
Early attention to eye discomfort or vision changes can help prevent minor issues from progressing into more serious conditions.
When Should You See an Eye Doctor?
You should visit an eye specialist if halos around lights:
- Are sudden and alarmingly increasing in number
- Are also causing eye pain, redness, etc.
- Make it difficult to carry on daily activities
- Continue even after resting or using lubricating eye drops
- Occur after eye surgery and do not show any improvement
Conclusion
Halos around lights are more than a minor inconvenience, it’s a sign of how your eyes function. There can be varying reasons for halos in eyes. Only a thorough diagnosis helps in understanding the right treatment option for this eye condition. Timely medical attention is the safe way to prevent long-term vision problems. When halos are sudden, persistent, or keep worsening with time, comprehensive eye checkup is a must.
Note: This brief is meant to guide the content creation process. Please use it for understanding, conduct additional research where needed and feel free to suggest improvements or changes.
FAQ
Are halos around lights normal?
Occasional halos can be normal, especially with eye fatigue, dry eyes, or uncorrected vision. However, frequent or worsening halos are not normal and should be evaluated by an eye specialist.
Do halos mean glaucoma?
Not always. While coloured halos can be an early warning sign of acute angle-closure glaucoma, most halos occur due to less serious causes like refractive errors or dry eyes. Sudden halos with pain require urgent care.
Can dry eyes cause halos?
Yes, dry eyes are among the common reasons for halos, making light dispersion, and forming halos or glare. Blinking and lubricating eye drops make these halos better.
Are halos permanent?
Mostly, halos are not permanent. Halos that occur due to dry eyes, post-surgical healing or refractive errors are generally short-term or temporary. Persistently seeing halos can be a sign of an underlying condition that requires treatment.
Why do I see halos at night?
In dim light, pupils of the eye dilate, letting more scattered light enter your eyes. This aggravates already existing eye problems, such as refractive errors, dry eyes, or corneal abrasions.
